Information processing apparatus and method thereof

An information processing apparatus comprising:

• control circuitry configured to:
• generate, on a basis of a bitstream of a geometry of 3D data, metadata including:
• first metadata including spatial configuration information of a subgroup, and
• second metadata including dependency information of the subgroup and a layer-group;
• generate a file that stores the bitstream and the metadata;
• and
• transmit the generated file,
• wherein the first and second metadata are stored in respective predetermined first and second International Standards Organization Base Media File Format (ISOBMFF) entities,
• wherein the layer-group is constituted by one or more layers in a tree structure based on a definition of the geometry,
• wherein the subgroup is configured by the geometry, the geometry being divided for each region in the layer-group,
• wherein the spatial configuration information includes information indicating a position and a size of a region in the laver-group corresponding to the subgroup, and
• wherein the dependency information is information indicating the subgroup or the layer-group as a reference destination,
• wherein the control circuitry stores the dependency information in a codec specific parameter in a sub sample information box of the file, the sub sample information box being the second predetermined ISOBMFF entity, the dependency information being stored as codec_specific_parameters that are stored in the sub sample information box.

An information processing method performed by an information processing apparatus comprising:

• on a basis of a bitstream of a geometry of 3D data, generating metadata including:
• first metadata including spatial configuration information of a subgroup, and
• second metadata including dependency information of the subgroup and a layer-group;
• generating a file that stores the bitstream and the metadata;
• and
• transmitting the generated file,
• wherein the first and second metadata are stored in respective predetermined first and second International Standards Organization Base Media File Format (ISOBMFF) entities,
• wherein the layer-group is constituted by one or more layers in a tree structure based on a definition of the geometry,
• wherein the subgroup is configured by the geometry, the geometry being divided for each region in the layer-group,
• wherein the spatial configuration information includes information indicating a position and a size of a region in the layer-group corresponding to the subgroup, and
• wherein the dependency information is information indicating the subgroup or the layer-group as a reference destination,
• wherein the spatial configuration information is stored in a sample entry of the file, the sample entry of the file being the first predetermined ISOBMFF entity,
• wherein the first predetermined ISOBMFF entity in the sample entry comprises a Geometry-based point cloud compression (G-PCC) layer infobox,
• wherein the spatial configuration information is stored as a layer infostruct in the G-PCC layer infobox, or
• wherein the spatial configuration information is stored in a sample entry of the file, the sample entry of the file being the first predetermined ISOBMFF entity, with the dependency information being stored in a codec specific parameter in a sub sample information box of the file, the sub sample information box being the second predetermined ISOBMFF entity, the dependency information being stored as codec specific parameters that are stored in the sub sample information box.

An information processing apparatus comprising:

• control circuitry configured to:
• receive a file that includes:
• a bitstream of a geometry of 3D data corresponding to a layer-group and a subgroup, and
• metadata that includes:
• first metadata including spatial configuration information of the subgroup, and
• second metadata including dependency information of the subgroup and the layer-group;
• on a basis of the metadata, extract the bitstream of the geometry of the 3D data;
• and
• decode the extracted bitstream,
• wherein the first and second metadata are stored in respective predetermined first and second International Standards Organization Base Media File Format (ISOBMFF) entities,
• wherein the layer-group is constituted by one or more layers in a tree structure based on a definition of the geometry,
• wherein the subgroup is configured by the geometry, the geometry being divided for each region in the layer-group,
• wherein the spatial configuration information includes information indicating a position and a size of a region in the layer-group corresponding to the subgroup, and
• wherein the dependency information is information indicating the subgroup or the layer-group as a reference destination,
• wherein the control circuitry extracts the bitstream on a basis of the spatial configuration information stored in a sample entry of the file, the sample entry of the file being the first predetermined ISOBMFF entity, and
• wherein the first predetermined ISOBMFF entity in the sample entry comprises a Geometry-based point cloud compression (G-PCC) layer infobox, with the spatial configuration information being stored as a layer infostruct in the G-PCC layer infobox.

An information processing apparatus comprising:

• control circuitry configured to:
• receive a file that includes:
• a bitstream of a geometry of 3D data corresponding to a layer-group and a subgroup, and
• metadata that includes:
• first metadata including spatial configuration information of the subgroup, and
• second metadata including dependency information of the subgroup and the layer-group:
• on a basis of the metadata, extract the bitstream of the geometry of the 3D data;
• and
• decode the extracted bitstream,
• wherein the first and second metadata are stored in respective predetermined first and second International Standards Organization Base Media File Format (ISOBMFF) entities,
• wherein the layer-group is constituted by one or more layers in a tree structure based on a definition of the geometry,
• wherein the subgroup is configured by the geometry the geometry being divided for each region in the layer-group,
• wherein the spatial configuration information includes information indicating a position and a size of a region in the laver-group corresponding to the subgroup, and
• wherein the dependency information is information indicating the subgroup or the layer-group as a reference destination,
• wherein the control circuitry extracts the bitstream on a basis of the dependency information stored in a codec specific parameter in a sub sample information box of the file, the sub sample information box being the second predetermined ISOBMFF entity, the dependency information being stored as codec_specific_parameters that are stored in the sub sample information box.

An information processing method performed by an information processing apparatus and comprising:

• receiving a file that includes:
• a bitstream of a geometry of 3D data corresponding to a layer-group and a subgroup, and
• metadata that includes:
• first metadata including spatial configuration information of the subgroup, and
• second metadata including dependency information of the subgroup and the layer-group;
• on a basis of the metadata, extracting the bitstream of the geometry of the 3D data;
• decoding the extracted bitstream,
• wherein the first and second metadata are stored in respective predetermined first and second International Standards Organization Base Media File Format (ISOBMFF) entities,
• wherein the layer-group is constituted by one or more layers in a tree structure based on a definition of the geometry,
• the subgroup is configured by the geometry, the geometry being divided for each region in the layer-group,
• the spatial configuration information includes information indicating a position and a size of a region in the layer-group corresponding to the subgroup, and
• the dependency information is information indicating the subgroup or the layer-group as a reference destination;
• and
• one of:
• extracting the bitstream on a basis of the spatial configuration information stored in a sample entry of the file, the sample entry of the file being the first predetermined ISOBMFF entity, the first predetermined ISOBMFF entity in the sample entry comprising a Geometry-based point cloud compression (G-PCC) layer infobox, with the spatial configuration information being stored as a layer infostruct in the G-PCC layer infobox, or
• extracting the bitstream on a basis of the dependency information stored in a codec specific parameter in a sub sample information box of the file, the sub sample information box being the second predetermined ISOBMFF entity, the dependency information being stored as codec specific parameters that are stored in the sub sample information box.